Actual and specific boost pressures. * Parameter 4 - Boost pressure actuator, feedback value (%) SPECIAL FUNCTIONS Many engine components must be " adapted " to the vehicle when replaced. Previously, components like turbocharger actuators were " plug and play. " Now, these components must be matched to the system. This is a way of setting the Yellow channel - turbocharger vane position sensor. Green channel - boost pressure sensor. base position for the actuator and position sensor and is used to detect possible faults or incorrect operation. OSCILLOSCOPE TESTING Another option to investigate the operation of a system is to use an oscilloscope. A scope provides a graphical representation of voltage over a particular time duration. The waveform below shows the output from the boost pressure sensor and the feedback from the turbocharger vane position sensor under wide open throttle operation on a road test. Not only is the scope good for diagnosing faults and validating repairs, but it can also be used to give the technician an in-depth understanding of the operation of a complicated system. Article provided by Snap-on Diagnostics Calibrations, simplifi ed Expert techs use expert tools. Master ADAS calibrati ons with the full-diagnosti c ADASLink® scan tool. Scan or visit hunter.com/adas For more information visit VehicleServicePros.com/10095198 2212PTENDIAGNOSTIC_HunterEngineering.indd 1 10/28/22 8:02 AM VehicleServicePros.com DECEMBER 2022 9http://www.hunter.com/adas http://www.VehicleServicePros.com/10095198 http://www.VehicleServicePros.com